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.r J <br /> San Joaquin County DIRECTOR <br /> o Pp U Ip o <br /> Environmental Health Department Donna Heran, REHSASSISTANT DIRECTOR <br /> 600 East Main Street Laurie Cotulla,REHS <br /> Stockton, California 95202-3029 PROGRAM COORDINATORS <br /> --_ -- Mike Huggins, REHS, RDI <br /> Margaret Lagorio, REHS <br /> Website: www.sjgov.org/ehd Robert McClellon, REHS <br /> -- Phone: (209) 468-3420 Jeff Carruesco,REHS, RDI <br /> Fax: (209) 464-0138 Kasey Foley,REHS <br /> December 31, 2008 <br /> Mr. Victorio Aranda <br /> c/o Victor Aranda 116141 <br /> Marled 4-0 f31'3 t.Su#6 <br /> Stockton, CA -95209 &1 S�oS <br /> Subject: Former Electro Delta <br /> 821 South Wilson Way <br /> Stockton, CA <br /> The San Joaquin County Environmental Health Department (EHD) reviewed "Well Installation <br /> Report" (Well Report) dated November 3, 2008, "Soil Vapor Extraction Pilot Test' (SVE Report) <br /> dated November 4, 2008, and "Quarterly Report— Third Quarter 2008" (Quarterly Report) dated <br /> November 4, 2008, prepared by Advanced GeoEnvironmental, Inc. (AGE) for the above subject <br /> site and provides the following comments. <br /> The Well Report data shows the soil contamination at this site has been sufficiently defined. <br /> There is a frontage road and an underpass east of the site which prohibit investigation in that <br /> direction. Soil samples from monitoring wells MW1, MW3 and vapor well VW2 provide lateral <br /> definition to the north, south and west respectively. Although, analytical results of soil samples <br /> from boring B5 and monitoring well MW5 show contamination to depths of 49 feet and 55 feet <br /> respectively, the vertical extent of soil contamination is provided by the analytical results of soil <br /> samples from monitoring well MW6 (located within 15 feet of the former underground storage <br /> tank location) that are non detect from 65 feet to 75 feet. <br /> The Quarterly Report has groundwater sample results from monitoring wells MW 1, MW2, MW3, <br /> MW5 and MW6. Monitoring well MW4 has not been sampled to date. The report recommends <br /> continuation of minimal quarterly ground water monitoring. If your consultant wants to <br /> recommend a reduction in sampling frequency for monitoring wells MW1, MW2 and MW3, <br /> please have them submit a proposal. Monitoring wells MW4, MW5 and MW6 are newly <br /> installed and must be sampled for four consecutive quarters prior to requesting a reduction in <br /> the frequency of their sampling. <br /> The SVE Report concludes that SVE could be used as a feasible remediation option for <br /> treatment of the hydrocarbon impacted soil and recommends preparation of a remediation work <br /> plan proposing SVE as the remediation technology for the impacted soil at the site. An interim <br /> remedial action plan to remediate the soil at this site should be prepared and submitted to the <br /> EHD by March 16, 2009. <br />